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Hymeniastrum sp.

genus Hymeniastrum Ehrenberg, 1847

• Modern species: Early Cretaceous - Present (150. 8 - 0.0 Ma)
• Habitat: Marine

• Classification
• kingdom Chromista, infrakingdom Rhizaria, phylum Radiozoa, class Polycystinea, order Spumellaria, family Spongodiscidae

• Distribution
• Miocene: Tochigi